Short leg tower extension



May 17, 1932.

c. M. GOODRICH SHORT LEG TOWER EXTENSION Filed April 5, 1928 Patented May 17, 1932 UNITED STATES CI-IAUNCEY MARSH eoonnrcii, or? wn iiison, crimes snom: LEG TOWER nxr'intsrdn Application filed. April 5, 1928'. Serial No. 'aezfiov'.

This invention relates to towers of the skeleton type, such as used to support high tension lines and the like, and has for its object the provision of a novel form of anchor and footing for such towers which will facilitate their erection on rock surfaces, and will eliminate the necessity of either excavating the rock to plant the anchor stubs or making diflicult and expensive changes 1n the configuration of the lower part of the tower outline, as have heretofore been the practice.

Another object is to provide a novel form of anchor-stub which is adjustable to compensate for the irregularities in the rock surface, and is also of sufficient strength to carry all bending strains in addition to the axial load delivered by the tower leg.

A still further object is to provide a base so anchored to the rock in two directions as to fix-end the extension stub at its lower end, and so provide the strength needed to resist horizontal stress due to the eccentric attachment of the diagonal.

In the drawings Figure 1 is an elevation of the lower end of a tower constructed and mounted in accordance with this invention.

Figure 2 is an enlarged fragmentary detail elevation showing the extension leg construction.

Figure 3 is a sectional plan of the base of the leg taken on the line IIIIII of Figure 2.

Referring more particularly to the drawings, the numeral 2 designates the tower legs which are tied together and supported by bracing 3. The legs 2 are supported by vertically adjustable anchor-stubs A, composed of two relatively heavy angle members 4c and 5 telescopically mounted, one within the other, and det-achably secured together by bolts 6. The members 4 and 5 are provided with a series of holes to receive the bolts 6 so that said members 4; and 5 may be adjusted to form anchor-stubs of various lengths. The lower anchor-stub member 5 has its lower end bolted or otherwise secured to a pair of stifl members 7 and 8 mounted on a concrete pad 9.

The stiff members 7 and 8 are formedfrom short lengths of rolled sections which are arranged at right angles to each other to form an upstanding angle support for the anchor-stub member 5, which member is secured thereto by bolts 12. The stiff members 7 and 8 are secured in position by an chorbolts 13 which are anchored securely in the rock surface and extend up'through the concrete pad 9. I A

The pad '9 is provided to even up the surface and form a level or fiat base for the anchor-stub.

A diagonal bracing-member 14 extends down from the diagonal bracing of the tower proper and is connectedto the anchorgstub A of each leg, and is adapted to deliver horizontal stresses from the tower to the anchorstubs. The anchor-stubs A must, therefore, be of such size as to carry the horizontal component of the diagonal members 14 to the base or stiff members by bending, in addition to carrying the axial load delivered by the tower leg.

In operation, when erecting a tower on a rock surface, the points at which the anchorstubs are to be mounted are first located by the use of a templet, or by other suitable means, and then holes are drilled in the rock to receive the anchor-bolts 13, which may be of any desired type, such as expanding anchor-bolts or the like.

The bolts 13 may be grouted in the holes or otherwise secured, if desired. After the bolts 13 are mounted in position, the height of the footings or concrete pads 9 will be located and indicated by locating a pair of jam nuts on the bolts at the proper position, the concrete pad .9 will be formed and the stiff members 7 and 8 will be mounted in position and secured by the bolts 13. The anchor-stub members A are then bolted or otherwise secured to the stiff members 7 and 8, and the sections 4 and 5 of the anchorstub members are then adjusted so as to compensate for the variations in the elevation of the rock surface and locate the upper ends of all of the anchor-stubs in the same plane. The tower proper may then be erected in the usual manner.

While I have shown and described one specific embodiment of my invention it will be understood that I do not Wish to be limited thereto, since various modifications may be made without departing from the scope thereof, as defined in the appended claim.

I claim In a tower structure for mounting on a rock surface, footings for the tower legs, said footings each comprising a plurality of anchor bolts secured in said rock, a concrete pad formed around said bolts, a pair of short length channel members mounted on said pad and arranged at right angles with one flange parallel and in contact with said pad, and with their Web portions extending vertically, one of said channel members being positioned with one end abutting the back of the Web of the other channel member at a point intermediate the ends of said last named channel member so as to form a triangular recess to receive angle-shaped anchor-stubs, said channel members being secured to said bolts and forming stifi members, and extensible angle-shaped anchor-stubs mounted in the recesses formed by said channel members and having their flanges secured to the vertical Webs of said channel members.

In testimony whereof, I have hereunto set my hand.

CI-IAUNOEY MARSH GOODRICI-I. 

